TinyJPG - Compress JPEG images with perfect quality and file size
Smaller - Make your websites load faster
ImageResizer - Free online app to crop and resize images
Website Grader - Grade your website's strengths and weaknesses in seconds.
Big Photo - Overcome the image resolution limit on iOS devices
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.